Spark-plug



A. R. MOSLER.

SPARK PLUG.

I A PPLICATION FILED SEPT. 16, I916- 1,344,956. Patented June 29, 1920.i

.in in which UNITED. STATES PATENT OFFICE.

ARTHUR MOSLER, OF NEW YORK, N. Y., ASSIGNOR TO A. R. MOSLER & COMPANY,OF MOUNT VERNON, NEW YPRK, A CORPORATION OF NEW YORK.

SPARK-PLUG.

Application filed September 16, 1916. Serial No. 120,525.

T 0 all whom it may concern:

Be it known that I, ARTHUR R. Mosnnn, a citizen of the United States,and resident of the borou h of Manhattan, in the city and State of ewYork, have invented a new and usefulImprovement in Spark-Plugs, of whichthe following is a specification.

This invention relates to an improvement in spark plugs and has for itsobject to provide a priming device which will be slmple in construction;readily manipulated; and cheap to manufacture.

A practical embodiment of my lnvention is represented in theaccompanying drawigure 1 represents a side elevation of a spark plug,wlth my improved priming device applied thereto,

Fig. 2 represents a longitudinal central section taken in the plane ofthe line AA of Fig. 1, looking in the direction of the arrows,

Fig. 3 represents a horizontal section taken in the plane of the lineB-B of Fig. 1 looking in the direction of the arrows,

Fig. 4 represents a detail longitudinal section of a modified form ofinsulating block,

Fig. 5 represents a detail side elevation ofthe upper portion of aninsulating block, and

Fig. 6 represents a detail front elevation of the same.

' The spark plug comprises a base 1 having bores 2, 3, between which aseat 4 isformed for the insulating block 5. The insulating block 5comprises a reduced inner portion 6, a reduced outer portion 7 and anenlarged intermediate portion 8, the formation of which provides annularshoulders 9, 10, extending around the periphery of the block. The block5 is secured to the base 1 by means of a hollow bushing 11 having ascrew threaded engagement with the bore 3.

A gasket 12 is interposed between the bushing 11 and the shoulder 10,and a gasket 13 is interposed between the seat 4 and the shoulder 9,thereby forming a gas tight oint between the block and base.

The block 5 has a central bore 14 extend-- A metal valve seat 17 may beinterposed between the bore 14 and the'fiare 16, be-

tween which seat and bore a packing ring 18 is inserted. An electrode 19is mounted to move freely in the central bore, and is provided with avalve 20 fixed thereon in position to coact with the valve seat 17. Theinner end of the electrode 19, when in its normal position, projectsinwardly beyond the bottom of the base 1 a suflicient distance so as tocooperate with the electrode 21 which is secured to the base 1 and bentin- Specification of Letters Patent. Patented J une- 29, 192() '25intermediate of the recesses 24, which are connected by an annularchannel 26. The cutaway portions 25 allow the lugs 23 on the cap 22 to(pass to the channel 26 whence they are turne until they arrive at theirrespective recesses, thus locking the cap on the block 5.

A spring 27 is interposed between the cap and valve on the electrode 19,so that the valve will be firmly pressed on its seat and the lugs on thecap held securely in their recesses.

The cap 22 is also provided wlth a binding post 28, which is screwthreaded for the reception of a thumb nut 29. I

The upper end'of the electrode 19 is split, as at 30, and spread apart,so as to prevent the electrode from slipping through the cap 22 whenremoved from the block 5, and, at the same time, afl'ording a means forremoving and holding the electrode by the cap.

11 the form shown in Fig. 4, the insulating block 5 has a seat 31 grounddirectly in the block, upon which seat the valve rests to close thebore.

In using the device, assumingthe plug to be in its operative position,the cap 22 is first forced downwardly against the tension of the spring27 until the lugs 23 are free of their recesses 24 and in the path ofthe annular channel 26, when the cap may be turned or rotated on theelectrode until the lugs 23 reach the cutaway portions 25 whereupon thecap and electrode will be free to be removed leaving the bore 14 withits flared flared at its upper end to form a and end 16 open andexposed. The flared end 16 serves as a priming cup into whlch a primingfluid may be introduced and passed through the bore 14 into the cylinderof the engine (not shown). After the priming fluid is in'ected, theelectrode may be nsorted in t e bore 14:, seating the v alve 20, placingthe cap 22 with its lugs 23 in position to pass downwardly on the blockat the cutaway portions 25. The further downward movement of the cap 22compresses the sprin 27 until the lugs 23 reach the channel 26, t en byturnin or rotating the cap upon the electrode unt1l the lugs 23 reachtheir respective recesses 24, the pressure may be relleved, whereuponthe lugs 23 will engage the recesses, thus locking the cap 22 in itsplace on the block and the valve 20 on its seat 17.

What I claim is 1. A spark plug comprising a block of insulatingmaterial havlng a longitudinal bore flared at its upper end to form apriming cup, an electrode movable in said bore, a valve on saidelectrode engaging said block at the junction of the flared portion andlongitudinal bore, a cap removably engaging the block for covering thebore, and means interposed between the cap and valve for yieldinglyholding the valve closed on the bore.

2. A spark plug comprising a block of insulating material having alongitudinal bore riming cup, a valve seat in the block at the unctionof the flared portion and longitudinal bore, an electrode movable insaid bore, a valve on said electrode arranged to coact with said seat inthe block for closing the bore, a cap removably engaging the block forcovering the flared portion and valve, and means interposed between thecap and valve for yieldingly holding the valve on its seat.

3. A spark plug comprising a block of insulating material having alongitudinal bore terminating in a flared portion at each end, theflared portion at the upper end forming a priming cup, a valve seat inthe block at the junction of the upper flared portion and longitudinalbore, an electrode movable in said bore, a valve on said electrodearranged to coact with said seat in the block for closing the bore, acap removably engaging the block for covering the'flared portion andvalve and means interposed between said ca) and valve for yieldinglyholding the valve on its seat.

4. A spark plug comprising a block of insulating material havingexterior annular recesses in its upper end and a longitudinal boreflared at its upper end to form a primng cup, a valve seat in the blockat the unct on of the upper flared portion and lontudmal bore, anelectrode movable in said ore, a valve on said electrode arranged tocoact with said seat in the block for closin the bore, a cap providedwith lugs adapted to engage sa1d recesses for coverin the flared portlonand valve, and means 1nterposed between said cap and valve foryieldingly holding the valve on its seat.

5. A spark plug comprising an insulating block having exterior recessesand cutaway portion formed in its outer end, a bore therethrough havingits end flared to form a priming cup, a valve seat interposed betweensaid flared portion and the bore, a cap provided w1th lugs adapted toremovably engage sald recesses for covering the primng cup and valveseat, an electrode movable in said bore, a valve on said electrodearranged to coact with said seat for closing sa1d bore, and meansinterposed between the cap and valve for yieldingly holding the valve onits seat.

6. spark plug comprising a block of insulating material having exteriorrecesses in its upper end and a longitudinal bore flared at its upperend to form a priming cu a valve seat in the block at the junction ofthe flared portion and longitudinal bore, an electrode movable in saidbore, a valve on said electrode arranged to coact with said seat in theblock for closing the bore, a cap provided with lugs adapted to engagesaid recesses for coverlng the flared portion and valve, and a commonmeans interposed between said cap and valve for yieldingly holding thevalve on its seat and the lugs in their recesses in the block.

7. A spark plug comprising a block of insulating material having alongitudinal bore flared at its upper end to form a priming cup, anelectrode movable in said bore, a valve on said electrode engaging saidblock for closing the bore, a cap slidable on the electrode and adaptedto removably engage the block for covering the valve and bore, the outerend of the electrode being split longitudinally and the portionsslightly spread apart to frictionally engage the cap to prevent itsunintentional displacement when disengaged from the block.

In testimony, that I claim the foregoing as my invention, I have signedmy name this 24th day of August, 1916.

ARTHUR R. MOSLER.

